Son of auto dealer quit job to sell used computers after placing $3 ad in Chicago Tribune to sell old PC. Reaped $300 profit on 2nd sale. Saw potential in discount computer sales, founded Computer Discount Warehouse 1984. Skilled negotiator brought used-car sales tactics to computer industry by offering salespeople high incentives. Retired 2001; today CDW Corp. sells $7 billion of computer gear. Company sold to private equity firm Madison Dearborn Partners for $7.3 billion in August; deal will close later this year. In June donated more than $350 million in CDW shares to charity.

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